The free attempt arrangement only applies to exams written in the past two semesters, summer semester 2020 and winter semester 2020/21. This means that any exams you fail or miss will be counted as usual and will reduce the remaining number of attempts available to you in accordance with the study and examination regulation for your degree programme.
If you are unsure whether you will be able to appear for the exams or successfully complete them, you can still cancel your registration before the withdrawal deadline. However, you will have to hurry, as the deadline for the Faculty of Business, Economics and Information Systems, the Faculty of Arts and Humanities and the 1st examination date for the Faculty of Computer Science and Mathematics is tomorrow, Friday 18 June 2021.